What is the output of this Java program?

class Driver $\{$

public static void main$($string$[]$ args$)\{$

foo $()$;

bar $(6)$

$\}$

static void foo$($int a$)\{$

bar $(a+1)$;

system.out.print$($a$)$;

$\}$

static void bar$($int a$)\{$

system.out.print$($a$)$;

$\}$

$\}$